Outside of Fillmore, the route curves to the northeast and heads through open, cultivated fields as it parallels the Genesee River, located to the southeast of NY 19A.

[3] Now in the Wyoming County town of Genesee Falls, the landscape surrounding NY 19A becomes more forested as the highway approaches Letchworth State Park.

NY 19A continues along the western bank of the Genesee River to the hamlet of Portageville, a riverside community located at the southern tip of the park.

Here, the forests that had surrounded NY 19A begin to give way to open fields as the route heads away from Letchworth State Park.

The route turns back to the north just west of the town line and continues onward through fields and forests toward the village of Silver Springs.

At the time, Route 16 utilized modern NY 19 between Fillmore and Rock Glen, a hamlet south of Warsaw.